I flew long-haul Polaris on UA1 (SFO-SIN) a few months back. I had low expectations of UA from the past, but Polaris met (maybe even slightly exceeded) those expectations. Would fly again if the price is reasonable.

Hard product felt like a standard reverse herringbone (generally my second favorite J layout after NH/QR-style suites), even though it was staggered - the adjustments they made took away some of the flaws of staggered seating for me. I had a bulkhead seat but the footwell wasn't any bigger than usual.

I found the soft product acceptable. Food was not mindblowing but decent, and the bedding was good. Service was also acceptable - no friendliness like the Asian airlines, but attentive enough.